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$ perl -MO=Deparse -wE "say scalar('a', 'e', 'i', 'o', 'u');"
Useless use of a constant ("a") in void context at -e line 1.
Useless use of a constant ("e") in void context at -e line 1.
...
use feature 'current_sub', 'evalbytes', 'fc', 'say', 'state', 'switch'
+, 'unicode_strings', 'unicode_eval';
say scalar('???', '???', '???', '???', 'u');
-e syntax OK

## a literal list in list context
$ perl -le " print( qw/ a b c d / )"
...
## null list in list context discards (the array kind of list )
$ perl -le " @f = qw/ a b c d /; print( () = @f )"